Anglo-Swedish Game Maker Readies Newest Saga

STOCKHOLM—After a dismal stock-market debut back in March, shares of King Digital Entertainment PLC are trading back around their initial public offering price—as investors warm to the idea that the game maker may be able to replicate its megahit "Candy Crush Saga."

It falls to Sebastian Knutsson, the company's creative chief, to prove them right.

A King co-founder, the 46-year-old Mr. Knutsson says the company has a...